diff options
| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 15:53:17 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 22:35:17 +0100 |
| commit | 803ea85053b75d35f9ebb3aa7a28db35d82c6d82 (patch) | |
| tree | c3533e07eb69e00552a416b1d8b5f3d0e97195d3 | |
| parent | b7f0292094cbe31f82f2cd9623c8356cc7cf9566 (diff) | |
net, rds: convert rds_mr.r_refcount from atomic_t to refcount_t
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/rds/rdma.c | 10 | ||||
| -rw-r--r-- | net/rds/rds.h | 4 |
2 files changed, 7 insertions, 7 deletions
diff --git a/net/rds/rdma.c b/net/rds/rdma.c index f06fac4886b0..8886f15abe90 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -84,7 +84,7 @@ static struct rds_mr *rds_mr_tree_walk(struct rb_root *root, u64 key, if (insert) { rb_link_node(&insert->r_rb_node, parent, p); rb_insert_color(&insert->r_rb_node, root); - atomic_inc(&insert->r_refcount); + refcount_inc(&insert->r_refcount); } return NULL; } @@ -99,7 +99,7 @@ static void rds_destroy_mr(struct rds_mr *mr) unsigned long flags; rdsdebug("RDS: destroy mr key is %x refcnt %u\n", - mr->r_key, atomic_read(&mr->r_refcount)); + mr->r_key, refcount_read(&mr->r_refcount)); if (test_and_set_bit(RDS_MR_DEAD, &mr->r_state)) return; @@ -223,7 +223,7 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args, goto out; } - atomic_set(&mr->r_refcount, 1); + refcount_set(&mr->r_refcount, 1); RB_CLEAR_NODE(&mr->r_rb_node); mr->r_trans = rs->rs_transport; mr->r_sock = rs; @@ -307,7 +307,7 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args, rdsdebug("RDS: get_mr key is %x\n", mr->r_key); if (mr_ret) { - atomic_inc(&mr->r_refcount); + refcount_inc(&mr->r_refcount); *mr_ret = mr; } @@ -756,7 +756,7 @@ int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, if (!mr) err = -EINVAL; /* invalid r_key */ else - atomic_inc(&mr->r_refcount); + refcount_inc(&mr->r_refcount); spin_unlock_irqrestore(&rs->rs_rdma_lock, flags); if (mr) { diff --git a/net/rds/rds.h b/net/rds/rds.h index 35ceaa2139c3..ea72d6e33c14 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -277,7 +277,7 @@ struct rds_incoming { struct rds_mr { struct rb_node r_rb_node; - atomic_t r_refcount; + refcount_t r_refcount; u32 r_key; /* A copy of the creation flags */ @@ -857,7 +857,7 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, void __rds_put_mr_final(struct rds_mr *mr); static inline void rds_mr_put(struct rds_mr *mr) { - if (atomic_dec_and_test(&mr->r_refcount)) + if (refcount_dec_and_test(&mr->r_refcount)) __rds_put_mr_final(mr); } |